The marijuana debate

Associated Press
Brian Vicente co-director of the Yes on 64 campaign waits to start a news conference about the legalization of marijuana at Civic Center Park in Denver on Wednesday, Nov. 7, 2012.  Colorado voters passed Amendment 64 on Tuesday legalizing marijuana in Colorado for recreational use. (AP Photo/Ed Andrieski)

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Pot smokers formally gained the right to light up in Colorado on Dec. 10 as Governor John Hickenlooper signed into effect a controversial ballot measure legalizing marijuana for adult recreational use in what proponents hailed as a "historic day."

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